Setting of barometers.



J. 13. MITCHELL.

SETTING OP BAROMBTBRS,

.APPLICATION FILED JUNE 3, 1909. l

, Patented Mar. 8, 1910.

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j Hill Grove,

UNITED STATES PATENT OFFICE.

JOHN BATTEN MITCHELL, OF CLASPHAM JUNCTION, LONDON, ENGLAND.

SETTING OF BAROMETERS.

To all lwhom it may concern:

Be it known that I, JOHN BATTEN MITCHELL, a subject of His Majesty the King of England, residing at 57 St. Johns Clapham Junction, London, England, have invented certain new and useful Improvements in the Sett-ing of Barometers, of which the following is a specification.

This invention relates to improvements in means for checking the rise and fall in barometers.

The principal object of this invention is to enable a set hand revolving about the outer periphery of the dial to be set at any given circumferential point by means located outside of the bezel.

A further object is to support the dial from brackets projecting above the face of the dial and to provide a set hand capable of revolution between the face of the dial and the under side of the brackets.

The invention is illustrated in the accompanying drawings in which Figure l is a front view of a barometer constructed according' to t-he present invention. Fig. 2 is a similar view to Fig. l but with the bezel and crystal removed and parts of the dial broken away to disclose the set-ting means. Fig. 3 is a vertical section of the barometer upon the line 3 3 of Fig. l.

Referring to the drawings, rz designates the barometer casing, the bezel, c the crystal, Z the dial and e the indicating hand or pointer, the mechanism for actuating the latter not being shown.

To support the dial I secure to the top f the casing a number of radial arms f, a convenient number being three set equi-distant apart, and to these arms is fastened the dial (Z which is placed under the arms so that it is suspended therefrom. The point of attachment between the arms and the dial is at a distance from the periphery of the dial suiiicient to provide clearance for the set hand, hereinafter referred to, to pass under the arms when being moved around the dial. Through the center of the dial, I secure a hollow arbor g which eX- tends beyond the under face of the dial and has suitably revolubly mounted thereon a toothed wheel it.

To the upper face of the wheel it, is secured a set hand z' which is bent or curved to extend over the front of the dial d and Specification of Letters Patent.

Application filed .Tune 3, 1909.

Patented Mar. S, 1910. Serial No. 499,936.

to clear the wheel j which is revolubly mounted in the side of the casing and is arranged to engage with the wheel It for turning the same, sufficient clearance between the dial CZ and the wheels it and y' being provided for, to allow the set hand z' to pass between the dial and the wheel j. The spindle of the latter wheel is preferably provided with a milled edge turning button r; conveniently positioned t0 be flush with the crystal c. IVith this arrangement the set hand can be positioned at any point of the entire circumference of the dial z'. e., the wheel CZ and its set hand i can be completely rotated.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States of America 1s l. In a barometer the combination with a casing, a dial and an indicating hand, of a bezel mounted on said casing, a solid crystal mounted in said bezel, brackets mounted on said casing between said dial and said crystal for supporting said dial at points within the circumference of said crystal and adapted to provide a clearance space between the face of said dial and the under sides of said brackets and between the points of attachment to said dial and points located outside the periphery of said dial, a wheel adapted to be rotated about the center of said dial, a set hand secured to said wheel and adapted to pass between said brackets and the face of said dial and means located outside of said bezel for rotating said wheel.

2. In a barometer thev combination with a casing, a dial and an indicating hand, of a bezel mounted on said casing, a solid crystal mounted in said bezel, brackets mounted on said casing between said dial and said crystal for supporting said dial at points within the circumference of said crystal and adapted to provide a clearance space between the face of said dial and the under sides of said brackets and between the points of attachment to said dial and points located outside the periphery of said dial, a wheel revolubly supported by said dial, a set hand secured to said wheel and adapted to pass between said brackets'and the face of said dial and means located outside of said bezel for rotating said Wheel.

3. In a barometer the combination With a casing, a dial and an indicating hand, of a bezel mounted on said casing, a solid crystal secured to said Wheel and adapted to piles between said bracketsmid the face of said dial and means located outside of said bezel for rotating said Wheel.

. In testimony whereof I aliix my Signature 1n presence of tWo Witnesses.

JOI-IN BATTEN MITCHELL.

mounted in said bezel, brackets mounted on said casing between said dial and said crystal for supporting` said dia-l at points Within the circumference of said crystal and adapted to provide a clearance space between the face of said dial and the under sides of said brackets and between the points of attachment to said dial and points located outside the periphery of said dial, a hollow arbor IVitnesses: r centrally mounted in said dial, a, Wheel rev- A. G. BARNES, olubly mounted on Said arbor, a set hand l S. COULSON. 

